Support a detailed message in swaynagbar

1 files changed, 153 insertions, 7 deletions

diff --git a/swaynagbar/render.c b/swaynagbar/render.c
index c0f59298..7bc2961e 100644
--- a/swaynagbar/render.c
+++ b/swaynagbar/render.c
@@ -23,11 +23,149 @@ static uint32_t render_message(cairo_t *cairo, struct sway_nagbar *nagbar) {
         }
 
         cairo_set_source_u32(cairo, nagbar->colors.text);
-        cairo_move_to(cairo, padding, (int)(height / 2.0 - text_height / 2.0));
+        cairo_move_to(cairo, padding, (int)(ideal_height - text_height) / 2);
         pango_printf(cairo, nagbar->font, nagbar->scale, true, "%s",
                         nagbar->message);
 
-        return nagbar->height;
+        return ideal_height;
+}
+
+static void render_details_scroll_button(cairo_t *cairo,
+                struct sway_nagbar *nagbar, struct sway_nagbar_button *button) {
+        int text_width, text_height;
+        get_text_size(cairo, nagbar->font, &text_width, &text_height,
+                        nagbar->scale, true, "%s", button->text);
+
+        int border = NAGBAR_BUTTON_BORDER_THICKNESS * nagbar->scale;
+        int padding = NAGBAR_BUTTON_PADDING * nagbar->scale;
+
+        cairo_set_source_u32(cairo, nagbar->colors.border);
+        cairo_rectangle(cairo, button->x, button->y,
+                        button->width, button->height);
+        cairo_fill(cairo);
+
+        cairo_set_source_u32(cairo, nagbar->colors.button_background);
+        cairo_rectangle(cairo, button->x + border, button->y + border,
+                        button->width - (border * 2), button->height - (border * 2));
+        cairo_fill(cairo);
+
+        cairo_set_source_u32(cairo, nagbar->colors.text);
+        cairo_move_to(cairo, button->x + border + padding,
+                        button->y + border + (button->height - text_height) / 2);
+        pango_printf(cairo, nagbar->font, nagbar->scale, true, "%s", button->text);
+}
+
+static int get_detailed_scroll_button_width(cairo_t *cairo,
+                struct sway_nagbar *nagbar) {
+        int up_width, down_width, temp_height;
+        get_text_size(cairo, nagbar->font, &up_width, &temp_height,
+                        nagbar->scale, true, "%s", nagbar->details.button_up.text);
+        get_text_size(cairo, nagbar->font, &down_width, &temp_height,
+                        nagbar->scale, true, "%s", nagbar->details.button_down.text);
+
+        int text_width =  up_width > down_width ? up_width : down_width;
+        int border = NAGBAR_BUTTON_BORDER_THICKNESS * nagbar->scale;
+        int padding = NAGBAR_BUTTON_PADDING * nagbar->scale;
+
+        return text_width + border * 2 + padding * 2;
+}
+
+static uint32_t render_detailed(cairo_t *cairo, struct sway_nagbar *nagbar,
+                uint32_t y) {
+        uint32_t width = nagbar->width * nagbar->scale;
+        uint32_t height = nagbar->height * nagbar->scale;
+        height -= NAGBAR_BAR_BORDER_THICKNESS * nagbar->scale;
+
+        int border = NAGBAR_DETAILS_BORDER_THICKNESS * nagbar->scale;
+        int padding = NAGBAR_MESSAGE_PADDING * nagbar->scale;
+        int decor = padding + border;
+
+        nagbar->details.x = decor;
+        nagbar->details.y = y + decor;
+        nagbar->details.width = width - decor * 2;
+
+        PangoLayout *layout = get_pango_layout(cairo, nagbar->font,
+                        nagbar->details.message, nagbar->scale, true);
+        pango_layout_set_width(layout,
+                        (nagbar->details.width - padding * 2) * PANGO_SCALE);
+        pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
+        pango_layout_set_single_paragraph_mode(layout, false);
+        pango_cairo_update_layout(cairo, layout);
+        nagbar->details.total_lines = pango_layout_get_line_count(layout);
+
+        PangoLayoutLine *line;
+        line = pango_layout_get_line_readonly(layout, nagbar->details.offset);
+        gint offset = line->start_index;
+        const char *text = pango_layout_get_text(layout);
+        pango_layout_set_text(layout, text + offset, strlen(text) - offset);
+
+        int text_width, text_height;
+        pango_cairo_update_layout(cairo, layout);
+        pango_layout_get_pixel_size(layout, &text_width, &text_height);
+
+        bool show_buttons = nagbar->details.offset > 0;
+        int button_width = get_detailed_scroll_button_width(cairo, nagbar);
+        if (show_buttons) {
+                nagbar->details.width -= button_width;
+                pango_layout_set_width(layout,
+                                (nagbar->details.width - padding * 2) * PANGO_SCALE);
+        }
+
+        uint32_t ideal_height;
+        do {
+                ideal_height = nagbar->details.y + text_height + decor + padding * 2;
+                if (ideal_height > NAGBAR_MAX_HEIGHT) {
+                        ideal_height = NAGBAR_MAX_HEIGHT;
+
+                        if (!show_buttons) {
+                                show_buttons = true;
+                                nagbar->details.width -= button_width;
+                                pango_layout_set_width(layout,
+                                                (nagbar->details.width - padding * 2) * PANGO_SCALE);
+                        }
+                }
+
+                nagbar->details.height = ideal_height - nagbar->details.y - decor;
+                pango_layout_set_height(layout,
+                                (nagbar->details.height - padding * 2) * PANGO_SCALE);
+                pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
+                pango_cairo_update_layout(cairo, layout);
+                pango_layout_get_pixel_size(layout, &text_width, &text_height);
+        } while (text_height != (nagbar->details.height - padding * 2));
+
+        nagbar->details.visible_lines = pango_layout_get_line_count(layout);
+
+        if (show_buttons) {
+                nagbar->details.button_up.x =
+                        nagbar->details.x + nagbar->details.width;
+                nagbar->details.button_up.y = nagbar->details.y;
+                nagbar->details.button_up.width = button_width;
+                nagbar->details.button_up.height = nagbar->details.height / 2;
+                render_details_scroll_button(cairo, nagbar,
+                                &nagbar->details.button_up);
+
+                nagbar->details.button_down.x =
+                        nagbar->details.x + nagbar->details.width;
+                nagbar->details.button_down.y =
+                        nagbar->details.button_up.y + nagbar->details.button_up.height;
+                nagbar->details.button_down.width = button_width;
+                nagbar->details.button_down.height = nagbar->details.height / 2;
+                render_details_scroll_button(cairo, nagbar,
+                                &nagbar->details.button_down);
+        }
+
+        cairo_set_source_u32(cairo, nagbar->colors.border);
+        cairo_rectangle(cairo, nagbar->details.x, nagbar->details.y,
+                        nagbar->details.width, nagbar->details.height);
+        cairo_fill(cairo);
+
+        cairo_move_to(cairo, nagbar->details.x + padding,
+                        nagbar->details.y + padding);
+        cairo_set_source_u32(cairo, nagbar->colors.text);
+        pango_cairo_show_layout(cairo, layout);
+        g_object_unref(layout);
+
+        return ideal_height;
 }
 
 static uint32_t render_button(cairo_t *cairo, struct sway_nagbar *nagbar,
@@ -50,7 +188,7 @@ static uint32_t render_button(cairo_t *cairo, struct sway_nagbar *nagbar,
         }
 
         button->x = *x - border - text_width - padding * 2;
-        button->y = (int)(height / 2.0 - text_height / 2.0) - padding;
+        button->y = (int)(ideal_height - text_height) / 2 - padding;
         button->width = text_width + padding * 2;
         button->height = text_height + padding * 2;
 
@@ -70,7 +208,7 @@ static uint32_t render_button(cairo_t *cairo, struct sway_nagbar *nagbar,
 
         *x = button->x - border;
 
-        return nagbar->height;
+        return ideal_height;
 }
 
 static uint32_t render_to_cairo(cairo_t *cairo, struct sway_nagbar *nagbar) {
@@ -93,6 +231,11 @@ static uint32_t render_to_cairo(cairo_t *cairo, struct sway_nagbar *nagbar) {
                 }
         }
 
+        if (nagbar->details.visible) {
+                h = render_detailed(cairo, nagbar, max_height);
+                max_height = h > max_height ? h : max_height;
+        }
+
         int border = NAGBAR_BAR_BORDER_THICKNESS * nagbar->scale;
         if (max_height > nagbar->height) {
                 max_height += border;
@@ -102,7 +245,7 @@ static uint32_t render_to_cairo(cairo_t *cairo, struct sway_nagbar *nagbar) {
                         nagbar->width * nagbar->scale, border);
         cairo_fill(cairo);
 
-        return max_height > nagbar->height ? max_height : nagbar->height;
+        return max_height;
 }
 
 void render_frame(struct sway_nagbar *nagbar) {
@@ -129,13 +272,16 @@ void render_frame(struct sway_nagbar *nagbar) {
                                 nagbar->buffers,
                                 nagbar->width * nagbar->scale,
                                 nagbar->height * nagbar->scale);
-                cairo_t *shm = nagbar->current_buffer->cairo;
+                if (!nagbar->current_buffer) {
+                        wlr_log(WLR_DEBUG, "Failed to get buffer. Skipping frame.");
+                        return;
+                }
 
+                cairo_t *shm = nagbar->current_buffer->cairo;
                 cairo_save(shm);
                 cairo_set_operator(shm, CAIRO_OPERATOR_CLEAR);
                 cairo_paint(shm);
                 cairo_restore(shm);
-
                 cairo_set_source_surface(shm, recorder, 0.0, 0.0);
                 cairo_paint(shm);